Check valve



Aug. 7, 1928.

l. B. GILBERT CHECK VALVE Filed April l2. 1924 INVENTOR.

I A TT ORNE Y.

may vbe varied at vvil'l to predetermine not onlyv the tensionvholding the check valve to its seat but also to predetermine theamount 'to prevent unauthorized operation of the Vau l contacts with the disk v valve.

valve stein to force the end of the valve stem against the disk 40 or the valve so as to prevent any lilt of the check valve from its seat, vland. also to enable the valve stem exteriorly of the valve casing to serve as an indicator rof the position ofthe. check valve and the amount ot' litt possessed by thecheck valve, I provide a split collar 42 vand a clamping serewr43 therefor lwhereby the collar 42 is clamped rigidly fupon they valve stem above the bonnet and serves both to limit the down- `,Ward movement oit' the valve stem to prevent positively closing the valve,l but also serves `vto indicate by its position above the bonnet theamount ot litt possessed by the eheel:

.Thevelutchteeth are preferably of sutilcient length that the valve stem may-have a considerable range of movement vertically Without disengaging the pin 34 from said teeth 33, thereby providing for rotating the valve-upon its seat by -rotating or by rocking the valve stem to regrind the valve seats or faces.v In the event that it is desired to posi- .tively close the valve upon its seat, the collar 42 is released from the valve stem and the stem20 is fed'downwardly compressing' the spring 37 until thepin 34 clears and is disengaged=f1om v*the lower `end of the clutch teeth 33Vand the lower end of the valve stem 40 to positively force the valve" to .its seat. -lVhen the valve stem-is againfifed upwardly the pin 34 again engages,'usually with a diferent pair of clutch Yteeth 33,- to establish rotarY` driving relation 'between the valve stem and valve, but with the. valvein anew position relative to its seat', Which vrfacilitates maintaining true faces upon ythe valve and the valve seat and efectively regrinding and restoringsaid :faces through rotation. of the valvel stem.v f l j The apparatus shown and described is ca- -being mounted upon the pable of considerable modilication within the scope of the claims Without departing from the spirit o1 my invention.

lVliat I claim is:

l. A cheek valve comprising a valve casing having a valve port and a valve seat, a valve stem positively adjustable toward and from said valve seat, a check valve in position to Vseat upon said valve seat, said valve inner end ot said valve stem to rotate with said valve stem and tol move to a limited extent endwise of said valve stem into and ont oi' engagement with said valve seat, said mounting of the valve upon the stem comprising a sleeve extending irom the rear face ot said valve in which the inner portion olf said Vvalve stein moves telescopieally to adjustably limit the lift of said check valve ilrom its seat, a collar 0n said valve stein outside of said sleeve, and a coiled spring encircling said sleevx and interposed between said valve and the collar on said valve stem to resiliently hold said valve to its seat.

2. In a valve, a easing having a seat, a valve stem axially movable with respect to the seat upon rotation Within the casing, a valve plug carried by the stem7 and means ol connection between the plug and stem to permit of a limited relative axial movenmnt therebetween when the plug is in engagement with the seat, said means of connection comprising an interiorly threaded axially recessed portion in the plug at the opposite side from its face, al sleeve threadedly en gaged in said recess and having longitudinal dian'ietrically disposed slots, the end et thestcm extending through said sleeve and provided with radially projecting shoulders engaging in said slots, a spring seat `surrounding the stem and a coiled expansion spring having its opposite ends respectively engaging the spring seat and valve plug for normally projecting the plug :trom the end of the stem.

In testimony whereof, I have hereunto laffixed my signature.

ISRAEL B. GILBERT. 

